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This CL enables the ContentSuggestions flag by default.
The rollout is currently being done using finch and will reach 100%
soon.

Bug: 764720
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I52ace8c4240275abf75b1e8b16433cbccbc78d15
Reviewed-on: https://chromium-review.googlesource.com/754840Reviewed-by: Menglu Huang <huangml@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517369}